o44 CLA.SSIFIGATION OP REPTILES. 



Cheltdra. Tail long, with crests of scales. 



PijATTSTEBKox. Tail long, without crests ; head large and 

 broad. 



Chelts. Nostrils much lengthened and tubular ; head and 

 neck with lobed appendages ; tail short. 



?.- 

 Faotlt 2. TESTUDIXID.E. 'Land Tortoises. 



Feet club-shaped ; toes very short, united as far as the claws. 



Testudo. Sternum immovable. 



Chersixa. Hinder part of the sternum movable. 



Ho^iopcs. Each foot with four toes and claws. 



Pyxis. Anterior part of the sternum movable. 



KiNixYS. Posterior part of the sternum movable ; hinder 

 feet with onlv four claws, fore feet with five. 



FaJtUly 3. EMYDiE. River Tortoises. 

 Tail short ; the toes distinctly separated, but united by a web. 



CiSTUDA. Sternum very wide, the two divisions movable. 

 EjiYs. Sternum immovable. 



KiKOSTERXox. Sternum rounded in front, of eleven plates ; 

 symphyses narrow. 

 Sternotherus. Sternum wide, the front lobes moveable ; jaws homy. 



CsELODiXA. Neck remarkably long. 



Hydraspis. Sternum narrow, solid ; nostrils short and 

 tubular. 



Fa^qly 4. TRIONYCID^E. Soft Tortoises. 

 Shell soft, covered with a skin ; claws only three. 



Trioxyx. Sternum narrow ; shell margin cartilaginous. 

 EflirrDA. Margin of the shell with small bones. 



Family 5. CHELONID.E. Sea Turtles. 

 Feet fin-shaped. 



Cheloxia. Shields hard, naked. 



SFRARGts. Shell covered with a coriaceous skin. 



